In subterranean civil engineering, ventilation shafts, also known as airshafts or vent shafts, are vertical passages used in mines and tunnels to move fresh air underground, and to remove stale air. In architecture, an airshaft is a small, vertical space within a tall building which permits ventilation of the building`s interior spaces to the out....
[n] - a shaft in a building
noun a shaft in a building; serves as an air passage for ventilation